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Equity-settled share-based payments - Key Grant Date Fair Value and Other Assumptions (Details) - $ / shares
Apr. 20, 2023
Mar. 17, 2023
Apr. 20, 2022
Apr. 01, 2022
May 13, 2021
Apr. 01, 2021
Share-Based Payment Arrangements [Abstract]            
Grant date, fair value (USD per share) $ 8.12 $ 7.44 $ 12.60 $ 10.87 $ 9.54 $ 7.84